Script Interpreter Execution From Suspicious Folder

Title: Script Interpreter Execution From Suspicious Folder
Status: test
Description:Detects suspicious script execution from suspicious directories or folders accessible by environment variables that may indicate malware activity. Script interpreters (cscript, wscript, mshta, powershell) executing from folders like Temp, Public, or user profile directories may suggest attempts to evade detection or execute malicious scripts.
References:
  -https://www.virustotal.com/gui/file/91ba814a86ddedc7a9d546e26f912c541205b47a853d227756ab1334ade92c3f
  -https://symantec-enterprise-blogs.security.com/blogs/threat-intelligence/shuckworm-russia-ukraine-military
  -https://learn.microsoft.com/en-us/windows/win32/shell/csidl
Author: Florian Roth (Nextron Systems), Nasreddine Bencherchali (Nextron Systems)
Date: 2022-02-08
modified:2026-02-17
Tags:

• -'attack.execution'
• -'attack.t1059'

Logsource:

• category: process_creation
• product: windows

Detection:
  selection_proc_image:
    Image|endswith:
      -'\cscript.exe'
      -'\mshta.exe'
      -'\wscript.exe'

  selection_proc_flags:
    CommandLine|contains:
      -' -ep bypass '
      -' -ExecutionPolicy bypass '
      -' -w hidden '
      -'/e:javascript '
      -'/e:Jscript '
      -'/e:vbscript '

  selection_proc_original:
    OriginalFileName:
      -'cscript.exe'
      -'mshta.exe'
      -'wscript.exe'

  selection_folders_1:
    CommandLine|contains:
      -':\Perflogs\'
      -':\Users\Public\'
      -'\%Public%'
      -'\AppData\Local\Temp'
      -'\AppData\Roaming\Temp'
      -'\Temporary Internet'
      -'\Windows\Temp'
      -'\Start Menu\Programs\Startup\'
      -'%TEMP%'
      -'%TMP%'
      -'%LocalAppData%\Temp'

  selection_folders_2:
    - CommandLine|contains|all:
      - ':\Users\'
      - '\Favorites\'
    - CommandLine|contains|all:
      - ':\Users\'
      - '\Favourites\'
    - CommandLine|contains|all:
      - ':\Users\'
      - '\Contacts\'
    - CommandLine|contains|all:
      - ':\Users\'
      - '\Documents\'
    - CommandLine|contains|all:
      - ':\Users\'
      - '\Music\'
    - CommandLine|contains|all:
      - ':\Users\'
      - '\Pictures\'
    - CommandLine|contains|all:
      - ':\Users\'
      - '\Videos\'
  filter_optional_chocolatey_installer:
    ParentImage:
      -'C:\Windows\System32\Msiexec.exe'
      -'C:\Windows\SysWOW64\Msiexec.exe'

    Image|endswith: '\powershell.exe'
    CommandLine|contains|all:
      -'-NoProfile -ExecutionPolicy Bypass -Command'
      -'AppData\Local\Temp\'
      -'Install-Chocolatey.ps1'

  condition:1 of selection_proc_* and 1 of selection_folders_* and not 1 of filter_optional_*
Falsepositives:
  -Various legitimate software have been observed to use similar techniques for installation or update purposes;thus, it is recommended to review and tune filters for your environment to reduce false positives before deploying to production.
Level: high